Piston-rod moisture swab



March 24, 1925.

W. CLEGG PISTON ROD MOISTURE SWAB Filed May 19, "1921 Patented Mar. 24, 1925.

UNITED STATES PATENT or.:F-rc=E WILLIAM canes, or "ronon'r'o, onranro, Carmen, nssienon 'ro inrnnnn'rronnii MACHINERY a sUrrn-Y co. LIMITED, or non'rannn, QUE-nae, cannon.

BISTON-ROD lEOIST-URE SW-AB.

Application-filed May 19,1921. Serial Nor 47-L024;

.To all whom it may concern-.1

Be it known that I, FNILLIAM Cranes, a subject of the King ofGr-eat Britain, and residing at 72 i i averley Road,- of the "city of Toronto, in the Province of @ntario, ,in

the Dominion of Canada, have invented a new and useful PistonRod Moisture-Swab,

of which the following is the specification.

The invention relates to piston rod moisture swab asdescribedinthe present specification and illustrated in tllB-dCQOHlPtLDY- ing drawings, that form part of the same.

The invei'i'tion' consists essentially of the novel construction pointed out broadly :and specifically in the claims for novelty following a description indetail otthe preferred form of the device.

The objects of the invention are to eliminate the leak of water along a piston rod 29 into a machine operated by a steam motor thereabove; to particularly overcome the inconveniences and difficulties in air pumps incident to the entrance of water into the compressor chamber from the steam chamber thereabove, such as is experienced in the air compressor on locomotives; to effect these purposes in a simple and inexpensive manner; and generally to provide an attachment, which is cheap, durable and eiii- I cient in avoiding the water troubles in air pumps. I

In the drawings, Figure 1 is an outline 01' a portion 01 the locomotive, showing the steam operated air compressor and the invention applied thereto.

Figure 2 is an enlarged sectional view of the stutling boxes and the swab therebetween, showing the piston rod extending theretlnj'ough.

Figure 8 is a cross sectional View on the line 33 in Figure 2.

Figure 4 is a perspective detail of the swab casing apart from the piston rod.

Like numerals of reference indicate corresponding parts in each figure.

'Reilerring to the drawings, the invention shown between the engine 1 and compressor 2 of an air pump of a locomotive and encircles the piston rod 3.

The upper and lower stuii'ing boxes 1 and 5 respectively are externally threaded and closed in by the caps 6 and 7 which press the gaskets 8 and 9 toward the springs 10 and 11, sald caps having the spanner bosses 12 and 13.

casing 14 are joined by the barrel -hinge @joints 1? said hinge joints having cotter pins 18, andeaeh said half'o't swab casing having discharge ports 19 at the lower end thereof, a'ndthe half :16 havingan oil inlet adapted to beconneeted to a suitable lubri eating oilsupply by the pipeQO. From the inner walls of the said halves 15 and 16 the flanges 22 and 28 extend -inwardlyand terminate before-they reach the piston rod 3, sothat thereis anjannu'lar ,port for the discharge of condensation wat'eraround the saitl piston rod 8, and atthe same time the said flanges Iact-aj-s iasugpport for the-swab tween the halves 15 and 16, forming the said casing 14, and completely filling the space between said casing 141 and said piston rod 3. The extreme ends of the Walls of said casing 14 project over the nuts 6'and 7 and come into contact with the spanner bosses 12 and 18 and form a spacer therebetween. An absolute lock for the nuts 6 and 7 is consequently formed as the said nuts cannot move so long as they are spaced in this manner.

In the operation of this invention the condensation water leaking down on the periphery of the piston rod 3 eventually finds its way through the stufling box 4:, no matter how careful the packing may be arranged. But when this condensation water enters the swab casing 14: it is wiped by the swab 24, and the rod is completely cleared of all moisture, the surplus water flowing through the port surrounding the piston rod at the flanges 22 and 23 and through the discharge ports 19. The said discharge ports are left open so that water may flow harmlessly away from the rod. In this way no water reaches the compressor chamber. The piston rod is wiped with an oily swab, which affords excellent lubrication as this oil is an additional protection against the entrance of water into the compressor chamber.

What I claim is 1. In a piston rod moisture swab device, a piston rod, a swab casing having inwardly extending projections spaced from the lower end and having openings in the wall below said projections encircling the piston rod, an air pump having a steam mechanism, driving a compressor mechanism, and the The two halves -15 and 16 of the swab 1 124, which encircles the piston rod 3 be piston rod forming the connection therebetween, and a swab in the casing supported by the projections and encircling said piston-rod between said steam-mechanism and said compressor mechanism.

2. In a piston rod moisture swab, a piston rod extending between an air pump and its drive member mounted on said pump and said drive member respectively, a pair of stufling boxes closed in at the end by caps, a swab encircling the piston rod and a swab casing in vertical halves suitably joined-and having flanged sections supporting said swab, and water discharge ports beneath the flanges.

3. In a piston rod moisture swab, a piston rod extending between an air pump and its drive member mounted on said pump and said drive member respectively, a pair of stufling boxes closed in at the end by caps, a swab encircling said piston rod be tween saidstufling boxes and a swab casing formed in halves, each half having a flanged sectiontowards its lower end and ports beneath the flanged sections, and one of said halves having an oil inlet adapted to be connected to a suitable lubricant supply.

4. In a piston rod moisture swab, a piston rod extending between an air pump and its drive member mounted on said pump and said drive member respectively, a pair of stufing boxes, each stutfing box having the packing therein enclosed by screw caps, said screw caps having vertical spanner bosses therearound, a swab of suitable material encircling said' piston rod between said caps and a swab casing formed in halves and extending over said caps into contact with said spanner bosses and joined by barrel hinged joints and pins, each of said halves having flanges extending part way to said piston rod and supporting said swab as well as water discharge ports below said flanges, and one or said halves having an 011 inlet adapted to be connected to a suitable supply. Signed at Toronto, Ont, this 13th day of May, 1921.

WILLIAM CLEGG. \Vitnesses:

G. MURPHY, F. O. BROMLEY. 

